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A synthesis reaction occurs when two or more simple substances combine to form more complex substances. A + B -> AB

Reversing a synthesis reaction gives decomposition reaction. AB ->A + B

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Flavio Mitchell

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2y ago
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13y ago

The characteristics of chemical reactions are :

1) Change of colour - When citric acid is added to Potassium permangenate then the purple colour starts discharging .

2)Change of state - When hydrogen(gas) reacts with oxygen(gas) , they form water a liquid

3)Evolution of a gas - When lead nitrate is heated the it decomposes to lead oxide , nitrogen dioxide with oxygen .

4) Formation of a precipitate - When lead nitrate reacts with potassium iodide , it forms a yellow precipitate Lead iodide and potassium nitrate .

5)Change in temperature -

- Exothermic reaction - reaction in which heat is released

When quick lime reacts with water to form slaked lime , it releases a lot of energy .

- Endothermic reaction - reaction in which heat is absorbed

When hydrogen reacts with iodine to form hydrogen iodide , it absorbs a lot of energy .

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9y ago

the characteristics of chemical equations are:

bubbling, heating, change of colour and many others

it is actually as follows:

1. The equation must represent known facts.

2. The equation must contain the correct formulas for the reactants and products

3. The law of conservation of mass must be satisfied

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Q: What is a characteristic of a reaction?
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